Charm physics confronts high-pT lepton tails

We present a systematic survey of possible short-distance new-physics effects in (semi)leptonic charged- and neutral-current charmed meson decays. Using the Standard Model Effective Field Theory (SMEFT) to analyze the most relevant experimental data at low and high energies, we demonstrate a striking complementarity between charm decays and high invariant mass lepton tails at the LHC. Interestingly enough, high-pT Drell-Yan data offer competitive constraints on most new physics scenarios. Furthermore, the full set of correlated constraints from K, π and τ decays imposed by SU(2)L gauge invariance is considered. The bounds from D(s) decays, high-pT lepton tails and SU(2)L relations chart the space of the SMEFT affecting semi(leptonic) charm flavor transitions.

Universal non-resonant explanation to charmoniumlike structures $$Z_c(3885)$$ and $$Z_c(4025)$$

Different from the usual tetraquark assignment to charged $$Z_c(3885)$$ Z c ( 3885 ) and $$Z_c(4025)$$ Z c ( 4025 ) charmoniumlike structures, in this letter we propose a universal non-resonant explanation to decode these $$Z_c$$ Z c ’s, which is based on a special dynamical behavior of $$e^+e^-\rightarrow D^{(*)}{\bar{D}}^*\pi $$ e + e - → D ( ∗ ) D ¯ ∗ π . Our study shows that $$Z_c(3885)$$ Z c ( 3885 ) and $$Z_c(4025)$$ Z c ( 4025 ) are only the reflection from the P-wave charmed meson $$D_1(2420)$$ D 1 ( 2420 ) involved in $$e^+e^-\rightarrow D^{(*)}{\bar{D}}^*\pi $$ e + e - → D ( ∗ ) D ¯ ∗ π . Obviously, the present work provides a unique perspective, which can be examined by future experiments like BESIII and BelleII.